examples/e2e-test-dataflow/src/main/java/util/MyBashExecutor.java
/*
 * Copyright (C) 2020 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package util;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;

public class MyBashExecutor {

  private static final Logger LOGGER = Logger.getLogger(MyBashExecutor.class.getName());

  public static BashOutput executeCommand(String command) throws Exception {

    LOGGER.info(String.format("Executing %s", command));
    Process process = Runtime.getRuntime().exec(String.format(command));
    BufferedReader processInputReader =
        new BufferedReader(new InputStreamReader(process.getInputStream()));
    BufferedReader processErrorReader =
        new BufferedReader(new InputStreamReader(process.getErrorStream()));
    int status = process.waitFor();
    BashOutput bashOutput = new BashOutput();
    bashOutput.setStatus(status);
    if (status == 0) {
      LOGGER.info(String.format("Execution (%s) success", command));
      bashOutput.setOutput(getResult(processInputReader));
    } else {
      LOGGER.info(String.format("Execution (%s) failed", command));
      bashOutput.setError(getResult(processErrorReader));
    }
    return bashOutput;
  }

  public static List<String> getResult(BufferedReader reader) throws Exception {
    List<String> output = new LinkedList<>();
    String line = reader.readLine();
    while (line != null) {
      output.add(line);
      line = reader.readLine();
    }
    return output;
  }
}
